我有一个函数来处理一个事件
public void Delete(bool raiseEvent)
{
if (raiseEvent)
{
RaiseEvent(new EdgeDeletedRoutedEventArgs(DeletedEvent, this));
}
....some other stuff
}
我订阅该功能如下：
Class.Delete += SomethingDeleted;
void SomethingDeleted(object sender, EdgeDeletedRoutedEventArgs e)
{
if (someCondition)
{
// here i want to cancel the delete function which raises the event
}
}
怎么可能取消删除功能，这样“其他东西”就不会在不中断我的应用程序的情况下执行呢？
我尝试在SomethingDeleted中抛出一个异常，并在Delete中捕获该异常，但它中断了我的应用程序和id，以保持应用程序运行。
将bool cancel属性添加到EdgeDeletedRoutedEventArgs（与CancelEventArgs一样）
public void Delete(bool raiseEvent)
{
if (raiseEvent)
{
var args = new EdgeDeletedRoutedEventArgs(DeletedEvent, this);
RaiseEvent(args);
if (args.Cancel) return;
}
....some other stuff
}
void SomethingDeleted(object sender, EdgeDeletedRoutedEventArgs e)
{
if (someCondition)
{
e.Cancel = true;
return;
}
}
如果您不真正需要RoutedEvent功能，请使用常规事件(event EventHandler)并从CancelEventArgs继承EdgeDeletedEventArgs
